<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    .a {
      width: 60vw;
      height: 100vh;
      border: 1px solid #333;
      display: flex;
    }
    .b {
      height: 100px;
      width: 200px;
      flex: 1;
      background-color: greenyellow;
    }
    .c {
      height: 100px;
      width: 200px;
      background-color: skyblue;
    }
    .d {
      height: 100px;
      width: 200px;
      background-color: greenyellow;
    }
    .b-b {
      height: 100px;
      width: 100px;
      background-color: yellow;
    }
    .d-d {
      height: 100px;
      width: 100px;
      background-color: pink;
      margin-left: 100px;
    }
  </style>
  <body>
    <div class="a">
      <div class="b">
        <div class="b-b">lalal</div>
      </div>
      <div class="c">ccc</div>
      <div class="d"><div class="d-d">lalal</div></div>
    </div>
  </body>
</html>
